
/****************************************************************************** 
 * 
 *  file:  UnlabeledValueArg.h
 * 
 *  Copyright (c) 2003, Michael E. Smoot .
 *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
 *  All rights reverved.
 * 
 *  See the file COPYING in the top directory of this distribution for
 *  more information.
 *  
 *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS 
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 *  DEALINGS IN THE SOFTWARE.  
 *  
 *****************************************************************************/ 


#ifndef TCLAP_UNLABELED_VALUE_ARGUMENT_H
#define TCLAP_UNLABELED_VALUE_ARGUMENT_H

#include <string>
#include <vector>

#include "ValueArg.h"
#include "OptionalUnlabeledTracker.h"


namespace TCLAP {

/**
 * The basic unlabeled argument that parses a value.
 * This is a template class, which means the type T defines the type
 * that a given object will attempt to parse when an UnlabeledValueArg
 * is reached in the list of args that the CmdLine iterates over.
 */
template<class T>
class UnlabeledValueArg : public ValueArg<T>
{

  // If compiler has two stage name lookup (as gcc >= 3.4 does)
  // this is requried to prevent undef. symbols
#ifndef __BORLANDC__
  using ValueArg<T>::_ignoreable;
  using ValueArg<T>::_hasBlanks;
  using ValueArg<T>::_extractValue;
  using ValueArg<T>::_typeDesc;
  using ValueArg<T>::_name;
  using ValueArg<T>::_description;
  using ValueArg<T>::_alreadySet;
  using ValueArg<T>::toString;
#endif
public:

  /**
   * UnlabeledValueArg constructor.
   * \param name - A one word name for the argument.  Can be
   * used as a long flag on the command line.
   * \param desc - A description of what the argument is for or
   * does.
   * \param req - Whether the argument is required on the command
   * line.
   * \param value - The default value assigned to this argument if it
   * is not present on the command line.
   * \param typeDesc - A short, human readable description of the
   * type that this object expects.  This is used in the generation
   * of the USAGE statement.  The goal is to be helpful to the end user
   * of the program.
   * \param ignoreable - Allows you to specify that this argument can be
   * ignored if the '--' flag is set.  This defaults to false (cannot
   * be ignored) and should  generally stay that way unless you have 
   * some special need for certain arguments to be ignored.
   * \param v - Optional Vistor.  You should leave this blank unless
   * you have a very good reason.
   */
  UnlabeledValueArg( const std::string& name, 
                     const std::string& desc, 
                     bool req,
                     T value,
                     const std::string& typeDesc,
                     bool ignoreable = false,
                     Visitor* v = NULL); 

  /**
   * UnlabeledValueArg constructor.
   * \param name - A one word name for the argument.  Can be
   * used as a long flag on the command line.
   * \param desc - A description of what the argument is for or
   * does.
   * \param req - Whether the argument is required on the command
   * line.
   * \param value - The default value assigned to this argument if it
   * is not present on the command line.
   * \param typeDesc - A short, human readable description of the
   * type that this object expects.  This is used in the generation
   * of the USAGE statement.  The goal is to be helpful to the end user
   * of the program.
   * \param parser - A CmdLine parser object to add this Arg to
   * \param ignoreable - Allows you to specify that this argument can be
   * ignored if the '--' flag is set.  This defaults to false (cannot
   * be ignored) and should  generally stay that way unless you have 
   * some special need for certain arguments to be ignored.
   * \param v - Optional Vistor.  You should leave this blank unless
   * you have a very good reason.
   */
  UnlabeledValueArg( const std::string& name, 
                     const std::string& desc, 
                     bool req,
                     T value,
                     const std::string& typeDesc,
                     CmdLineInterface& parser,
                     bool ignoreable = false,
                     Visitor* v = NULL );           
            
  /**
   * UnlabeledValueArg constructor.
   * \param name - A one word name for the argument.  Can be
   * used as a long flag on the command line.
   * \param desc - A description of what the argument is for or
   * does.
   * \param req - Whether the argument is required on the command
   * line.
   * \param value - The default value assigned to this argument if it
   * is not present on the command line.
   * \param constraint - A pointer to a Constraint object used
   * to constrain this Arg.
   * \param ignoreable - Allows you to specify that this argument can be
   * ignored if the '--' flag is set.  This defaults to false (cannot
   * be ignored) and should  generally stay that way unless you have 
   * some special need for certain arguments to be ignored.
   * \param v - Optional Vistor.  You should leave this blank unless
   * you have a very good reason.
   */
  UnlabeledValueArg( const std::string& name, 
                     const std::string& desc, 
                     bool req,
                     T value,
                     Constraint<T>* constraint,
                     bool ignoreable = false,
                     Visitor* v = NULL ); 

    
  /**
   * UnlabeledValueArg constructor.
   * \param name - A one word name for the argument.  Can be
   * used as a long flag on the command line.
   * \param desc - A description of what the argument is for or
   * does.
   * \param req - Whether the argument is required on the command
   * line.
   * \param value - The default value assigned to this argument if it
   * is not present on the command line.
   * \param constraint - A pointer to a Constraint object used
   * to constrain this Arg.
   * \param parser - A CmdLine parser object to add this Arg to
   * \param ignoreable - Allows you to specify that this argument can be
   * ignored if the '--' flag is set.  This defaults to false (cannot
   * be ignored) and should  generally stay that way unless you have 
   * some special need for certain arguments to be ignored.
   * \param v - Optional Vistor.  You should leave this blank unless
   * you have a very good reason.
   */
  UnlabeledValueArg( const std::string& name, 
                     const std::string& desc, 
                     bool req,
                     T value,
                     Constraint<T>* constraint,
                     CmdLineInterface& parser,
                     bool ignoreable = false,
                     Visitor* v = NULL);
            
  /**
   * Handles the processing of the argument.
   * This re-implements the Arg version of this method to set the
   * _value of the argument appropriately.  Handling specific to
   * unlabled arguments.
   * \param i - Pointer the the current argument in the list.
   * \param args - Mutable list of strings. 
   */
  virtual bool processArg(int* i, std::vector<std::string>& args); 

  /**
   * Overrides shortID for specific behavior.
   */
  virtual std::string shortID(const std::string& val="val") const;

  /**
   * Overrides longID for specific behavior.
   */
  virtual std::string longID(const std::string& val="val") const;

  /**
   * Overrides operator== for specific behavior.
   */
  virtual bool operator==(const Arg& a ) const;

  /**
   * Instead of pushing to the front of list, push to the back.
   * \param argList - The list to add this to.
   */
  virtual void addToList( std::list<Arg*>& argList ) const;

};

/**
 * Constructor implemenation.
 */
template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                        const std::string& desc, 
                                        bool req,
                                        T val,
                                        const std::string& typeDesc,
                                        bool ignoreable,
                                        Visitor* v)
  : ValueArg<T>("", name, desc, req, val, typeDesc, v)
{ 
  _ignoreable = ignoreable;

  OptionalUnlabeledTracker::check(req, toString());

}

template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                        const std::string& desc, 
                                        bool req,
                                        T val,
                                        const std::string& typeDesc,
                                        CmdLineInterface& parser,
                                        bool ignoreable,
                                        Visitor* v)
  : ValueArg<T>("", name, desc, req, val, typeDesc, v)
{ 
  _ignoreable = ignoreable;
  OptionalUnlabeledTracker::check(req, toString());
  parser.add( this );
}

/**
 * Constructor implemenation.
 */
template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                        const std::string& desc, 
                                        bool req,
                                        T val,
                                        Constraint<T>* constraint,
                                        bool ignoreable,
                                        Visitor* v)
  : ValueArg<T>("", name, desc, req, val, constraint, v)
{ 
  _ignoreable = ignoreable;
  OptionalUnlabeledTracker::check(req, toString());
}

template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                        const std::string& desc, 
                                        bool req,
                                        T val,
                                        Constraint<T>* constraint,
                                        CmdLineInterface& parser,
                                        bool ignoreable,
                                        Visitor* v)
  : ValueArg<T>("", name, desc, req, val, constraint,  v)
{ 
  _ignoreable = ignoreable;
  OptionalUnlabeledTracker::check(req, toString());
  parser.add( this );
}

/**
 * Implementation of processArg().
 */
template<class T>
bool UnlabeledValueArg<T>::processArg(int *i, std::vector<std::string>& args) 
{
  
  if ( _alreadySet )
    return false;
  
  if ( _hasBlanks( args[*i] ) )
    return false;

  // WEL: Do no allow unlabeld args that start with "-". If they are
  // allowed, then the parser cannot detect invalid options!

  if ( _ignoreable && Arg::ignoreRest() )
    return false;

  if (args[*i].find_first_of( Arg::flagStartString() ) == 0)
    return false;

  // never ignore an unlabeled arg
  // WEL: except for those that start with a "-"
  
  _extractValue( args[*i] );
  _alreadySet = true;
  return true;
}

/**
 * Overriding shortID for specific output.
 */
template<class T>
std::string UnlabeledValueArg<T>::shortID(const std::string&) const
{
  std::string id = "<" + _typeDesc + ">";

  return id;
}

/**
 * Overriding longID for specific output.
 */
template<class T>
std::string UnlabeledValueArg<T>::longID(const std::string&) const
{
  // Ideally we would like to be able to use RTTI to return the name
  // of the type required for this argument.  However, g++ at least, 
  // doesn't appear to return terribly useful "names" of the types.  
  std::string id = "<" + _typeDesc + ">";

  return id;  
}

/**
 * Overriding operator== for specific behavior.
 */
template<class T>
bool UnlabeledValueArg<T>::operator==(const Arg& a ) const
{
  if ( _name == a.getName() || _description == a.getDescription() )
    return true;
  else
    return false;
}

template<class T>
void UnlabeledValueArg<T>::addToList( std::list<Arg*>& argList ) const
{
  argList.push_back( const_cast<Arg*>(static_cast<const Arg* const>(this)) );
}

}
#endif
